Abstract:

The creeping reversion experiments of 3 kinds of polymer solutions with different molecular weight were conducted in porous media. The porous media are 3 kinds of micro-model with different structures. They are capillary model, grid model and natural model. The relaxation time was obtained by matching the experimental data. Viscoelastic behaviors of polymer solutions with different molecular weight were evaluated by combining the relaxation time and flow rate variation ratio. The effect of creeping reversion on the oil displacement efficiency was laboratory investigated in artificial cores. Experimental results show that the relaxation time increase with molecular weight, and the flow rate variation ratio affected by the molecular weight. The creeping reversion property can be used to improve oil displacement efficiency.

Key words: polymer solution, creeping reversion, micro-model, relaxation time, oil displacement efficiency, core flooding experiment